Not CLeared by chip erase!

Instrumentation Trace Macrocell

j-link  mem32 E0000000   30      total 0x100   (in words) mostly 0-0

nrfjprog --memrd 0xE0000000 --n 0x50000 |sed "s/00000000/        /g; /:                                       /d; s/ 000000/       /g "
E0000000:       01       01       01       01   I T M
E0000010:       01       01       01       01   Instrumentation Trace Macrocell 
E0000020:       01       01       01       01   
E0000030:       01       01       01       01   
E0000040:       01       01       01       01   
E0000050:       01       01       01       01   
E0000060:       01       01       01       01   
E0000070:       01       01       01       01   
…
E0000EF0:       01       00       00       00   
E0000FB0:       00       03       00       00   
E0000FD0:       04       00       00       00   
E0000FE0:       01       B0       3B       00   
E0000FF0:       0D       E0       05       B1

Data Watchpoint and Trace

j-link 
 mem32 E0001000  10      total 0x100   (in words) mostly 0-0
 mem32 E0001FC0  10   (in words)

E0001000: 4      1       14       00       00   D W T
E0001010:       00       00       00 FFFFFFFF   Data Watchpoint and Trace
E0001020:      0-0      0-0      0-0      0-0    
E0001030:       00       00      200       00   count LSU and CPI cycles. 
…
E0001FD0:       04       00       00       00   
E0001FE0:       02       B0       3B       00   
E0001FF0:       0D       E0       05       B1

An LSU cycle is an additional cycle for a load or store, and a
CPI cycle is an extra cycle used for multi-cycle instructions or caused by an instruction fetch stall.
To use them disable, then re-enable them in the DWT->CTRL register (which clears them to zero), do some work, then read the DWT->CPICNT and DWT->LSUCNT. DevZone

Trace Port Interface Unit

 mem32 E0041000  10      total 0x100   (in words) mostly 0-0
 mem32 E0041F80  20   (in words)
E0040000:       0B       01       00       00   T P I U
E00400F0:       01       00       00       00  Trace Port Interface Unit  
…
E0040300:       08      102       00       00   
…
E0040FA0:       0F       00       00       00   
E0040FC0:       00       00      CA1       11   
E0040FD0:       04       00       00       00   
E0040FE0:       A1       B9       0B       00   
E0040FF0:       0D       90       05       B1   

E0041000:     0411 8C802000       00       00   E T M
E0041010:       02    20C09       00       00   Embedded Trace Macrocell 
…
E00411E0:     0400 4114F250 18541800       00   
…
E0041310:       00       01       00       00   
…
E0041EE0:       10       00       00       00   
E0041EF0:       01       00       00       00   
…
E0041FA0:       0F       00       00       00   
E0041FB0:       00       03       C0       00   
E0041FC0:       00       00       00       13   
E0041FD0:       04       00       00       00   
E0041FE0:       25       B9       0B       00   
E0041FF0:       0D       90       05       B1   




setbp 0001f5ac
Breakpoint set @ addr 0x0001F5AC (Handle = 1)
J-Link> mem32 E0002000,100
E0002000 = 00000261 20000000 4001F5AD 00000000   F P B Flash Patch and Breakpoint Unit 



                                                SCS  System Control Space    2xxxx  have _NS name sufix  
E000ED00: 410FC241       00       00 FA050000   

E000ED00  CPUID_S   RO  410CD200    CPUID Register.41:Arm, C:Armv8-M, D20:Cortex-M23
E002ED00  CPUID_NS  RO  410CD200 
E000ED04  ICSR_S    RW[a]  0  Interrupt Control and State Register.
E000ED08  VTOR      RW  0  Vector Table Offset Register.
E000ED0C  AIRCR_S   RW[a] FA050000 Application Interrupt and Reset Control Register.


E000ED10:       00      200       00       00   
E000ED10  SCR_S     RW  0  System Control Register .
E000ED14  CCR_S     RW  0x00000204  Configuration and Control Register.

E000ED1C  SHPR2_S   RW  0  System Handler Priority Register 2.


E000ED20  SHPR3_S   RW  0  System Handler Priority Register 3.
E000ED24  SHCSR_S   RW  0  System Handler Control and State Register.

E000E008  ACTLR_S   RW  0  Auxiliary Control Register.


E000ED30:       09 E000EDF8 E000EDF8       00   
E000ED40:       30      200 00100000       00   
E000ED50: 00100030       00 01             00   
E000ED60: 01101110 02112000 21232231 01111131   
E000ED70: 01310132       00       00       00   
E000ED90:      800       00       00       00   
E000EDF0:    30003       00       00 01         
E000EF30:       00 C      0       00       00   
E000EF40: 10110021 11000011       00       00   
E000EFD0:       04       00       00       00   
E000EFE0:       0C       B0       0B       00   
E000EFF0:       0D       E0       05       B1